Heating-furnace



(No Model.)

R. A. MAY.

HEATING FURNAGE.

No. 442,291. i Patented Deo. 9, 1890.

UNITED STATES PATENT OFFICE.

RUDOLPH A. MAY, OF AKRON, OlIlO.

HEATING-FURNACE.

SPECIFICATION forming part of Letters Patent No. 442,291, dated December 9, 1890.

Application filed April 18, 1890. Serial No. 348,490. (No model.)

T0 all who/l2, it 111,111/ concer/t:

Be it known that I, RUDOLPH A. MAY, a citizen of the United States, residing at Akron, in the county of Summit and State of Ohio, have invented a certain new and useful Improvement in Heating -Furnaces, of which the following is a specification.

My invention relates, generally, to improvements in that class of heating-furnaces having an enlarged combustion-chamber above the fire-pot, and has special relation to furnaces of this class in which bituminous coal is used as fuel and in which a contracted space is interposed above the fire-pot and between it and the combustion-chamber.

The objects of my invention are to secure by means of circulating currents in the combustion-chamber a more perfect burning of the gases arising from the fuel, to provide a new and improved diving-flue, and by means of these to obtain an increase of heat from the amount of fuel consumed.

To the above objects my invention consists in the peculiar and novel construction and combination of parts hereinafter described, and then specifically pointed out in the claim, reference being had to the accompanying drawings, forming a part of this specification.

In the accompanying drawings, in which similar letters of reference indicate like parts, Figure l is a vertical central section at the line a of Fig. 2 of a heating-furnace embodying my invention; Fig. 2, a horizontal section of the same at the line x a1 of Fig. l.

Referring to these drawings, A is the outer case,in which the air is heated by radiation from the inclosed parts. This case rests on a rim B, which extends horizontally above the ash-pit O. Resting on the ash-pit O is the fire-pot D, having a dome-shaped iop E, having a contracted top F, and a feeding-spout G, which extends through the case A and is closed with a door in the usual manner.

Mounted on the top E is a cylindrical drum II, larger in diameterand height than the firepot, and which I have heretofore referred to and for the purposes of this application designate as the combustion-chamber.

I am aware that this parthas been variously denominated in applications for patents and in trade-circulars as the heatingdrum,the

Extending from the horizontal center and slightly above the vertical centerof this combustion-chamber is a pipe or flue I, which, passing through the case A, is connected with the chimney and constitutes the uptake-flue for the furnace.

Connected with the flue I inside of the chamberlIisadiving-iiue J,which extends through the bottom of the chamber I-I and then curves outward, passing through the caseA and terminating in a cleaning-gate M.

Uniting the flues'I and J outside of the case A is a fiue K, and in the ue I, between its points of union with the ilues .I K, is a gate L, by which it may be closed.

In operation the products of combustion from the fuel in the lire-peti), rising through the contracted space F, lose their momentum as they enter the enlarged chamber H and expand and fill said chamber, giving them an opportunity to burn instead of being directly drawn into the uptake-fine. By placing the opening of t-he flue I in the horizontal and near the vertical center of this chamber H this result is greatly increased,as the currents of gas circulate on every side around and above said opening before they pass out, thus retarding their escape and securing a more perfect combustion than if the uptake-fine were in the top or at one side of the chamber A as ordinarily constructed,in which cases a direct current is created between the contracted opening F and the mouth of the uptake-flue. By turning the gate L the products of combustion pass down through the divingiiue J and connecting-flue K. By this arrangement the diving-flue .I is heatedboth externally and internally, and not only communicates this increased heat by radiation to the air inside of the case A, but by reason of this increased heat the deposit of soot or condensed carbon therein is prevented.

I claim as my invention- In a furnace of the kind specified, the combin ation, with the enlarged combustion-chain- IOO as shown and described, and for the purpose 1 specified.

In testimony that I claim the above Ih ereunto Set my hand.

RUDOLPH A. MAY.

In presence of-- C. P. HUMPHREY, C. E. HUMPHREY. 

